Researchers have recently identified a planet they say is in the “habitable zone” around its star—a planet at the right distance from its star to have liquid water on the surface.1 Dubbed Gliese 581g,2 it orbits around the Red Dwarf star Gliese 581, which is about 20 light-years from Earth. The planet is about 3–4 times the mass of Earth (estimated to be 1.1–1.7 times Earth’s gravity1) and is about 0.15 AU3 from Gliese 581, which is said to be within the estimated habitable zone for planets around Gliese 581.

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